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Inverse Trigonometric Functions

Oswaal

CBSE

Grade 12

Question:

Value of $\cos^{-1}\left(\cos \frac{13\pi}{6}\right)$ is:
(a) $\pi/6$
(b) $13\pi/6$
(c) $5\pi/6$
(d) $\pi/3$

Step-by-Step Solution

Key Concept: cos^{-1}(cos(2\pi + \pi/6)) = \pi/6.

The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.

Correct Answer: $\pi/6$

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